This is an optional Serpent V2 Full Rear Spring Set, and is intended for use with the Serpent S811 Cobra 2.0 1/8 scale buggy, as well as the rest of the S811 1/8 scale buggy and truggy line. This set includes six pairs of rear V2 springs. These V2 springs feature a 1.4 wire for a softer feel over the bumps.